Dynamo-electric machine



June 11, 1940. K. K. COOPER DYNAMO-ELECTRIG MACHINE Filed Jan. 20, lss

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Patented June 11, 1940 UNITED STATES PATENT OFFICE DYNAMO-ELECTRIC MACHINE Kenneth R. Cooper, Fort Wayne, Ind., assignor to General Electric Company, a corporation of New York Application January 20, 1938, Serial No. 185,884 8 Claims. (01.248-23) My invention relates to dynamo-electric marails'll. These mounting rails are provided with chines, and more particularly to mountings for downwardly extending flanges l8 at each side uch chine thereof, and are rigidly connected together by a An object of my invention is to provide a pair of supporting elements or rods 28 extending dynamo-electric machine or the likewith a fricthrough openings formed in bosses 2| on the I tional driving connection having an improved. flanges l8. Set screws 22 threadedly engage arrangment for regulating the friction in the openings in the lower sides of the bosses 2| and driving connection. engage the under surface of the supporting rods Further objects and advantages of my in- 20, so as to secure the rails in position relative l0 vention will become apparent and my invention to the rods 23. lo

will be better understood from the following de- In order to support the dynamo-electric mascription referring to the accompanying drawchine for pivotal movement about the eccentric ing, and the features of novelty which charaxis, curved or arcuate tracks 23 are arranged at acterize my invention will be pointed out with each end of the rods 28, and secured to adjacent particularity in the claims annexed to and ends of the pair of rods 23 by screws 24 threadforming part of this specification, edly eng n penings 25 formed in the ends For a better understanding of my invention, of these rods. The curvature of this pair of reference is made to the accompanying drawing arcuate tracks 23 is formed on a center of curvawherein Fig. l is an end elevation, partly broken ture 23 on the eccentric pivotal axis of the dynaaway, of a dynamo-electric machine provided mo-electric machine within the radius of the 20 with a mounting embodying my invention: Fig. 2 frictional driving connection of the belt and is a plan view of the mounting base of the mapulley. In order to provide for the pivoting of chine shown in Fig. 1; Fig. 3 is a sectional view the stationary member of the machine about this taken along line 3-3 of Fig. 1; and Fig. 4 is a axis through the center of curvature 26 of the sectional view taken along line 4-4 of Fig. 1. curved tracks 23, I provide -a pair of rollers 21 2., Referring to the drawing, I have shown a rotatably secured by bolts 28 to an upwardly exdynamo-electric machine having a stationary tending flange 28 formed on a supporting memmember Ill and a rotatable member mounted on ber arranged on each side of the mounting base. a shaft ll. Power is transmitted from the These supporting members are arranged to be 30 dynamo-electric machine to a driven machine secured in position by screws or bolts 38 extend- 30 through a flexible frictional driving connection ing through openings in inwardly extending comprising a driving belt l2 which engages a flanges 3| formed on the supporting members. pulley l3 mounted on the shaft II. The rollers 21 are formed with a central opening During normal operation of the dynamo-elec- 32 and are supported by ball bearings 33 on the tric machine, it is desirable that this supporting bolts 28 and are formed with a groove 34 on the 35 arrangement should utilize a displacing force outer peripheral surface thereof which engages exerted by the belt l2 to vary the tension in the. the lower edge of the curved tracks 23 to assist belt in accordance with the load transmitted. in guiding and retaining these tracks in assem- In order to provide the desired starting and bled relation on the mounting base. To prevent running friction in the driving connection, the axial tilting of the machine on the mounting stationary member ill of the dynamo-electric base, and to provide for slight adjustment there'- machine is supported so as to move pivotally of, a third roller 35 is arranged to engage rotatabout an axis within the belt loop between the ably the upper surface of each curved track 23. tight side of the belt and the axis 14 of the shaft, These rollers are rotatably supported by ball and also on the side of a vertical plane through bearings 36 on bolts 31 secured in bosses 38 45 the axis l4 of the shaft toward the open side of formed on the upwardly extending supporting the belt loop on the pulley I 3. This pivotal axis members 28. Slight adjustment of the position is eccentric to the axis 14 of the rotatable memof these third rollers 35 is provided by mounting ber of the machine. The stationary member of each supporting bolt 31 in a central opening 38 the dynamo-electric machine is provided with a formed in an eccentric cam or bushing 40. The no set of supporting feet l5 adjustably secured to outer peripheral surface 4i of the bushing is conthe mounting base by bolts l3 extending through centric with the opening in the upwardly exopenings in the feet l5 and through transversetending supporting member boss 38, and the ly extending slots l1 formed adjacent the ends opening through the bushing 48 for the bolt 31 of a pair of transversely extending mounting is formed eccentric with respect to the outer 66 I lower side of the belt peripheral surface of the bushing. A hexagonal outer surface 42 is provided on the bushing cam between the upwardly extending supporting member boss 38 and the roller 35 to facilitate turning of the bushing and to provide for adjusting the position of the supporting bolt 31 and roller 35 with respect to the curved track 23 and the supporting member 29. A set screw 43 threadedly engages an opening in the top of the boss 38 and engages the upper peripheral surface of the bushing cam 40' to retain it in any desired position. In this manner, the dynamoelectric machine is rotatably supported by curved tracks 23 on the rollers 21 and can pivot in freely tiltable relation about an axis 28 eccentric with respect to the rotational axis ll of the rotatable member of the machine. A pair of stops or lugs 44 are formed on the inner surface of each of the upwardly extending supporting member flanges 29 to limit the rotational movement of the curved tracks 23, so that when the dynamo-electric machine has pivoted about the axis 26 so that the head of either of the screws 24 engages one of the stops ,the curved track 23 will be prevented from rotating any further and dropping off one of the rollers 21.-

With such a pivotal mounting of the dynamoelectric machine, it is necessary to maintain the driving pulley in contact with the driving belt when the machine is at rest, so that there will be suflicient'friction between the pulley and the belt to start the load. This initial biasing force is provided by supporting the dynamo-electric machine on the mounting rails l8 so that the rotational axis M of the rotatable member of the dynamo-electric machine and a greater proportion of the weight of the machine is nearer the side of the belt loop in engagement with the pulley than on the disengaged side of the pulley. In this manner, the weight of the machine tends to pivot it into the loop of the belt about the pivotal axis 26 and provides the initial tension thereon. The starting friction of the belt may be adjusted by varying the relative position of u the dynamo-electric machine supporting feet I!) on the mounting rails l8, thereby varying the eccentricity of the pivotal axis 26 with respect to the center of gravity of the machine.

During operation, the driving friction is increased by tightening of the belt l2 when the rotatable member of the motor rotates in a clockwise direction, as viewed in Fig. 1 and indicated by the arrow 45. Under these conditions, the l2, will be the tight side, and the upper side will be the loose side of the belt. In order to obtain a tightening of the'belt, it is, therefore, necessarythat the torque about the pivotal axis 26 resulting from the displacing force exerted on the machine by the tight side of the belt be greater than the torque about this axis resulting from the displacing forceexerted on the machine by the loose side of the belt. A consideration of these displacing forces in relation to the pivotal axis indicates that the location of the pivotal axis should be at a lesser distance from the rotational axis of the rotatable member than the radius of the pulley and eccentric with respect to this rotational axis on the driving side of the frictional connection, which, in the illustrated embodiment of my invention, is the tight side of the belt. This eccentric arrangement of the pivotal support for the dynamoelectric machine and the particular relation of the pivot to the sides of the belt is not my invention, but is the invention of Wilbur W.

Warner, and is described and claimed in his U. 8. Patent 2,074,135, March '16, 1937, and assigned to the General Electric Company, assignee of this application.

While I have illustrated and described a particular embodiment of my invention. modifications thereof'will occur to those skilled in the art. I desire it to be understood, therefore, that my invention is not to be limited to the particular arrangements disclosed, and I intend in the appended claims to cover all modifications which do not depart from the spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

l. A dynamo-electric machine or the like including a stationary member and a rotatable member, a supporting member provided with curved tracks, a second supporting member, and means secured to one of said supporting members arranged to engage said curved track for pivotally supporting said dynamo-electric machine in freely tiltable relation about an axis eccentric with respect to the rotational axis of said rotatable member.

2. A dynammelectric machine or the like including a stationary member and a rotatable member, a supporting member provided with curved tracks, a second supporting member, and means including rollers rotatably secured to one of said supporting members and engaging said curved tracks for pivotally supporting said stationary member in freely tiltable relation about an axis eccentric with respect to the rotational axis of said rotatable member.

3. A dynamo-electric machine or the like including a stationary member and a rotatable member, amounting base for said stationary member, a support, rollers rotatably secured to said support, and means including a curved track secured to said mounting base and carried by said rollers for supporting said stationary member movably in freely titlable relation about an axis eccentric with respect to the rotational axis of said rotatable member.

4. A dynamo-electric machine or the like including a stationary member and a rotatable member provided with a frictional driving connection adapted to exert a"'displacing force on said .machine, a supporting member provided with curved tracks, a second supporting member, and means including rollers'rotatably secured to one of said supporting members and engaging said curved tracks for supporting said stationary member in freely tiltable relation about an axis eccentric with respect to the rotational axis of said rotatable member and for utilizing said displacing force exerted on said machine by said driving connection to vary the driving friction in said driving connection.

5. A dynamo-electric machine or the like including a stationary member and a rotatable member provided with a frictional driving connection adapted to exert a displacing force on said machine, a supporting member provided with arcuate tracks having a center of curvature arranged on an axis within the radius of said frictional driving connection and eccentric with respect to the rotational axis of said rotatable member, a second supporting member, and means including rollers rotatably secured to one of said porting members for rotatably supporting each of tracks for supporting said stationary member pivotally in freely tiltable relation about said eccentric axis and for utilizing said displacing force exerted on said machine by said driving connection to vary the driving friction in said driving connection.

6. A dynamo-electric machine or the like including a stationary member and a rotatable member, a plurality of curved tracks secured to said stationary member, a pair of supporting members. means including a pair of rollers rotatably secured to each of said supporting members and engaging said curved tracks for supporting said stationary member pivotally in freely tiltable relation about an axis eccentric with respect to the rotational axis of said rotatable member, and means including a third roller engaging the upper surface of each of said curved tracks for retaining said curved tracks in place.

'7. A dynamo-electric machine or the like ineluding a stationary member and a rotatable member, a plurality of curved tracks secured to said stationary member, a pair of supporting members, means including a pair of rollers rotatably secured to each of said supporting members and engaging said curved tracks for supporting said stationary member pivotally about an axis eccentric with respect to the rotational axis of said rotatable member, means including a third roller engaging the upper surface of each of said curved tracks for retaining said curved tracks in place, and means including an eccentric cam adiustably secured to each of said supporting members for rotatably supporting each of said third rollers.

.an axis eccentric with respect to 8. A dynamo-electric machine or the like including a stationary member and a rotatable member provided with a frictional driving connection adapted to exert a displacing force on said machine, a pair of mounting rails secured to said stationary member, a pair of transversely extending supporting rods secured to said mounting rails in spaced-apart relation, a pair of curved tracks, means for securing one of said curved tracks to adjacent ends of said supporting rods at each end thereof. a pair of supporting members. means including a pair of rollers rotatably secured to each of said supporting members and engaging said curved tracks for supporting said stationary member pivotally about the rotational axis of said rotatable member and for utilizing said displacing force exerted on said machine by said driving connection to vary the driving friction in said driving connection, means includ-' ing a third roller engaging the upper surface of each of said curved tracks for retaining said curved tracks in place, means including an eccentric cam adjustably secured to each of said supporting members for rotatably supporting each of said third rollers, and means including stops formed-n said supporting members for limiting the displacement of said curved tracks with re spect to said supporting rollers.

KENNETH K. COOPER.

CERTIFICATE OF CORRECTION. Patent No. 2,201|.,L1.02. 4 June 11, 191m.

' KENNETH ii. COOPER.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, second' column, line 14.5, claim 5, for "titlable'iread --tiltab1e--; line 72, claim 5, strike out "porting members for rotat'abl'ysupport-ing each of" and insert instead --supporting members and engaging said arcuate-; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 50th day of July, A. D 19h0.

Henry Van Arsdale (Seal) Acting Commissioner of Patents. 

